IR spectra of resorcinol(+)-Ar-n cluster cations (n=1, 2): Evidence for photoionization-induced pi -> H isomerization

Patzer A; Langer J; Knorke H; Neitsch H; Dopfer O; Miyazaki M; Hattori K; Takeda A; Ishiuchi SI; Fujii M

Chemical Physics Letters, Vol.474, No.1-3, 7-12, 2009

DOI10.1016/j.cplett.2009.04.030 Export Citation

IR spectra of resorcinol(+)-Ar-n cluster cations (n=1, 2): Evidence for photoionization-induced pi -> H isomerization

Patzer A, Langer J, Knorke H, Neitsch H, Dopfer O, Miyazaki M, Hattori K, Takeda A, Ishiuchi SI, Fujii M

Resorcinol(+)-Ar-n cations (Rs(+)-Ar-n, n = 1,2) generated by resonant multiphoton ionization (REMPI) and electron ionization (EI) were assayed by their infrared (IR) photodissociation spectra in the OH stretch (nu(OH)) range. Several isomers distinguished by their Ar ligand binding sites and their Rs(+) isomeric cores are identified by characteristic Lambda nu(OH) complexation shifts. Neutral Rs-Ar-n complexes prefer intermolecular pi-bonding of Ar to the aromatic ring, whereas cationic Rs(+)-Ar-n clusters show predominant H-bonding to the acidic OH groups. The REMPI-IR spectra of Rs(+)-Ar-2 reveal mOH absorptions assigned to cold pi-bound complexes and hot H-bound complexes. The latter are generated via ionization-induced intermolecular pi -> H isomerization. (C) 2009 Elsevier B. V. All rights reserved.